Seeing as both ultimately lead to receptor downgrade, alternating them, *might* slow down those effects, but only complete discontinuation of the stack will allow for complete upregulation.
Both are Beta-2 Agonists - yes.
Knowing that caffeine, in some studies, has been shown to increease fat burning by 70% or more in aerobic exercise....why would one NOT add it to the mix?
"[Aspirin] is often added to fat-burner products because it appears to reduce urinary excretion of ephedrine, thus keeping it in the blood longer and prolonging ephedrine's stimulating effects," explains Sheri Barke, MPH, PD, a nutritionist at the UCLA Arthur Ashe Student Health and Wellness Center.
My comments, while unclear, were directed at the effects of caffeine and asprin as the continuation of a pm about the subject.
However, I have personally found that the vast majority of competitors who have added eca - ephedrine - caffeine - aspirin - ephedrine - caffeine - aspirin once the Clenbuterol's effectiveness have begun to fade a bit, have most definitely experienced an upswing in fat loss compared to the previous weeks of Clenbuterol alone.
For the record - I HATE this f'ning new feature on the boards that "thinks" for you.
LOL